Fix: fixed multipart_suggestion in index_refutable_slice uitest (#13727)

This should address #13099 for the derivable_impls test. As this
combines everything into a single multipart_suggestion, the feedback
message is a little less "targeted" than it was before, but now it
provides a complete`--fix`able suggestion - e.g.:

```
error: this binding can be a slice pattern to avoid indexing
  --> tests/ui-toml/max_suggested_slice_pattern_length/index_refutable_slice.rs:5:17
   |
LL |     if let Some(slice) = slice {
   |                 ^^^^^
   |
note: the lint level is defined here
  --> tests/ui-toml/max_suggested_slice_pattern_length/index_refutable_slice.rs:1:9
   |
LL | #![deny(clippy::index_refutable_slice)]
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
help: replace the binding and indexed access with a slice pattern
   |
LL ~     if let Some([_, _, _, _, _, _, _, slice_7, ..]) = slice {
LL |
LL |         // This would usually not be linted but is included now due to the
LL |         // index limit in the config file
LL ~         println!("{}", slice_7);
   |
```

changelog: [index_refutable_slice]: Fixed multipart_suggestions to
provide correct rustfix-able lint

0 files changed, 0 insertions, 0 deletions